US Bridges

I-5 over King-Jackson ST

Fair

King County, Washington · 0.3 N JCT I-90 · Structure no. 0007504B0000000

Built
1965
60 years old, rebuilt 1992
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
712 ft
9 main spans
Daily traffic
71,171
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over King-Jackson ST is a concrete continuous box beam or girders - multiple carrying I-5 over King-Jackson ST in King County, Washington. It was built in 1965 and reconstructed in 1992, so it is 60 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 71,171 vehicles a day, roughly 7% of them trucks, projected to reach 103,465 by 2039. The structure is 712 ft (217 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-5
CrossesKing-Jackson ST
Location0.3 N JCT I-90
RouteInterstate 5
CountyKing County
StateWashington
Coordinates47.59811, -122.32105
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating17.5 US tons
Inventory rating13.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20 + Mod
Structure length712 ft (217 m)
Longest span100 ft (30.5 m)
Deck width59 ft (17.9 m)
Roadway width56 ft (17 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71,171 (2023)
Projected traffic103,465 by 2039
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$19.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over King-Jackson ST built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1992.

What condition is I-5 over King-Jackson ST in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does I-5 over King-Jackson ST carry?

About 71,171 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-5 over King-Jackson ST?

The structure is 712 ft (217 m) long with a longest span of 100 ft (30.5 m) and a deck 59 ft wide.

Who owns I-5 over King-Jackson ST?

It is owned by the State Highway Agency.